Malicious PDF — malware analysis report

Static analysis result for SHA-256 a03a4c917521be19…

MALICIOUS

PDF

235.2 KB Created: 2021-04-04 19:10:04 +07:00 Authoring application: wkhtmltopdf 0.12.6 (via Qt 4.8.7) First seen: 2021-10-16
MD5: 9edb3a1a8b4b4a5cf65a66030cae9c92 SHA-1: 16313493eab693fea1e855389d18f7c30a8372b2 SHA-256: a03a4c917521be1981aad2db9deab2838058d790ae392a7991b969c05ad5562f
72 Risk Score

Malware Insights

MITRE ATT&CK
T1566.001 Spearphishing Attachment

The file is detected as malicious by ClamAV with a phishing signature related to Roblox. It contains an embedded URI pointing to a suspicious domain that purports to offer a Roblox download, and a heuristic firing for a download button lure. The document body, though heavily obfuscated, contains references to Roblox and download prompts, reinforcing the phishing attempt.

Machine Learning

  • Nyx PDF Classifier clean score 0.0491

Heuristics 4

  • ClamAV: Pdf.Phishing.Roblox062100-9873116-0 critical CLAMAV_DETECTION
    ClamAV detected this file as malware: Pdf.Phishing.Roblox062100-9873116-0
  • Visual download / call-to-action button lure low SE_DOWNLOAD_BUTTON
    Document contains a call-to-action phrase ('Click here to download', 'Download Now', etc.) — low-signal unless other findings point to a malicious workflow
  • External URI info PDF_URI
    PDF contains an external URL action
  • Embedded URL info EMBEDDED_URL
    One or more URLs were extracted from the document. The URL itself is not a detection — see the per-URL labels for which channel (macro, JS, link annotation, document body, ...) reached each URL.
    URL http://gaminggenerator.org/app/431946152/roblox-download-windows-10-free PDF link annotation
    • http://en.wikipedia.org/wiki/MIT_LicenseIn PDF document text

Extracted artifacts 2

Files carved from inside the sample during analysis.

FilenameKindSourceSize
stream_002_off00035675.bin decompressed-pdf-stream PDF FlateDecoded stream at offset 0x35675 21776 bytes
SHA-256: 9d4baf803ee73c9fb162e19e378c9ed8a7f9ee79185deb3adf6d216035935c76
font_01_sfnt_off0003868a.bin pdf-font-stream PDF embedded font (sfnt) at offset 0x3868A 18864 bytes
SHA-256: 92b2ef4190bbfa1db781f886376d93ab2a51d80e128b650e746c5cc6ad73ee71

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